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Cooling-control purification method of molten salt and impurity removal agent

An impurity removal and impurity technology, applied in the field of nitrate or nitrite purifier, can solve the problem of unused purification additives and the like

Inactive Publication Date: 2014-06-11
AILIA INNOVATIVE COMPANY LIMITED HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] U.S. Patent No. 4,568,352 discloses a purification method for alkali metal nitrates, which is to heat the brine solution, or melt it, and maintain a temperature for a period of time to precipitate and separate insoluble impurities. It does not use purification additives, so it can only remove the original Impurities such as calcium, magnesium, iron, molybdenum, nickel oxides, nitrides and silicates that are insoluble in molten salts

Method used

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  • Cooling-control purification method of molten salt and impurity removal agent
  • Cooling-control purification method of molten salt and impurity removal agent
  • Cooling-control purification method of molten salt and impurity removal agent

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This example demonstrates the method and steps for obtaining pure KCl by removing NaCl within one kilogram of KCl molten salt containing 5 weight percent (hereinafter referred to as wt%) NaCl.

[0027] In this example, first heat one kilogram of this mixed salt to above 800°C to melt it completely, and then add ammonium bicarbonate in the salt bath, the amount of addition is equivalent to 200% of the NaCl molar amount (ie 0.855 mole), also That is 1.71 moles of ammonium bicarbonate (164.25 grams). In this way, sodium ions and carbonate will be combined to form sodium carbonate with a high melting point, its melting point is 865°C, and its eutectic temperature with KCl is 587°C. The generated sodium carbonate will be completely dissolved in the liquid KCl molten salt, such as Figure II shown. Transfer the molten salt to a constant temperature furnace at 590+2°C and cool it slowly, then pure KCl will gradually solidify, and after a period of time, most of the KCl has s...

Embodiment 2

[0032] Like the KCl molten salt containing 5 wt% sodium chloride in Example 1, 1.71 moles of ammonium sulfate or ammonium diphosphate was used as the impurity removal agent.

[0033] The results of this example show that after the addition of ammonium sulfate or ammonium diphosphate, the potassium chloride crystals are purified by controlling constant temperature cooling at 694°C and 738°C respectively. After one implementation, the purification effect was reduced to 1.12 and 1.25 mol% of NaCl respectively, which was equivalent to that of Example 1.

Embodiment 3

[0035] For example, in the KCl molten salt containing 5 wt% sodium chloride in Example 1, the impurity removal agent uses 1.71 moles of ammonium hydroxide into KCl, and there is no purification effect after controlled cooling above the eutectic temperature. This is because the generated NaOH has a solid solubility of about 8 mol% in KCl. Therefore, sodium ions cannot be removed.

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Abstract

The invention discloses a cooling-control method for removing an impurity from a eutectic molten salt; an impurity removal agent is added into a non eutectic molten salt and together with the impurity generates a compound which can be co-crystallized with a main salt in the molten salt, so that cooling and purification can be controlled. The cooling-control method comprises that the molten salt is cooled from a temperature which is at least 20 DEG C higher than an main salt melting point to a temperature which is just within 2-5 DEG C above an eutectic temperature, then the main salt is solidified and purified, and the impurity compound is driven into an eutectic liquid and then is poured out to remove. The disclosed impurity removal agent comprises ammonium compounds of carbonate, sulfate, phosphate and the like. In one embodiment, ammonium hydrogen carbonate is added into a high-temperature potassium nitrate salt bath containing a sodium impurity, the salt bath is cooled at a constant temperature of 328+2 DEG C, and a solidified substance is pure potassium nitrate after completing solidification, and impurities of Na2CO3 and K2CO3 are contained in the eutectic liquid and discharged.

Description

technical field [0001] The technology of the present invention refers to the purification of salts containing impurities, in a word, it is a method of purifying eutectic molten salts containing impurities in its molten state, especially refers to controlled cooling, and removal of impurities by adding impurities when necessary Agent, which removes impurities by cationizing them to form high-temperature stable compounds. This method is suitable for halide salts, sulfates, nitrates or nitrites of alkali metals or alkaline earth metals, especially for the purification of nitrates or nitrites. The cations suitable for purification by pharmaceuticals include at least lithium, sodium, potassium, calcium, magnesium and the like. Background technique [0002] The physical and chemical properties of alkali metals, alkaline earth metals, or alkali metal compounds and alkaline earth metal compounds are similar. If an alkali (earth) metal salt contains impurities of another alkali (ea...

Claims

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Application Information

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IPC IPC(8): C01D1/28C01D9/16
Inventor 金禾山
Owner AILIA INNOVATIVE COMPANY LIMITED HONG KONG
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